Screen for threshing-machine separators.



NI N SCREEN FOB THRESHING- MACHINE SBPABATORS.

V APPLICATION FILED APR. 28, 1908. 945, 1 87, Patented Jan. 4, 1910.

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ITNESSES N. N. NELSON. SCREEN FOB. THRESHING MACHINE SEPARATORS.

APPLICATION FILED APR. 28, 19 08.

Patented Jan. 4,-1910.

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NICHOLAS 1\T. NELSON, OF OJA'IA, NORTH DAKOTA.

SCREEN FOR THRESHING-MACHINE SEPARATORS.

Specification of Letters Patent.

Application filed April 28, 1908.

Patented Jan. 4, 1910.

Serial No. 429,743.

To all whom it may concern:

Be it known that I, NICHOLAS N. NELSON, of Ojata, in the county of GrandForks and State of North Dakota, have invented certain new and usefulImprovements in Screens for Threshing-Machine Separators; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled inthe art to whichit appertains to make and use the same.

My invention relates to an improvement in screens for threshing machineseparators, and it consists in the parts and combinations of parts aswill be more fully explained and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation ofthe rear portion of a threshing machine showing my improved screensapplied thereto. Fig. 2 is an enlarged end view of the screens, the endsof the conveyer boxes being removed. Fig. 3 is a view in verticalsection through one of the conveyer boxes, the conveyer being shown inelevation, and Fig. 4 is a bottom plan View of the screens.

My improvement consists in one screw conveyer 1 of usual form locatedover a screen 2 constituting the bottom of the conveyer box, the latterbeingin a position to receive the cleaned grain from the shoe 3 Thisconveyer box is closed at one end and communicates at its oppositedischarge end with a second conveyer box located in a plane below saidfirst mentioned conveyer box. This second conveyer consists of a screenI constituting the bottom of the box and a screw conveyer 5, andcommunicates with the first mentioned conveyer box through the s out 6located at the ends of the two boxes 'arthest removed from the dischargeend 7 of the screen 4. The screw conveyer 1 in the higher box moves thegrain endwise toward spout (5 and discharges it into the latter, andthrough which it gravitates by reason of the inclination of the spout 6.

The spout 6 is made in two telescopic sections as shown, one sectionbeing secured to the upper screen, and terminating within the upper endof the lower section, the latter being secured to the lower screen 4,sufiicient space being provided to permit of the necessar movements ofthe screens.

This lmprovement is designed primarily for getting rid of the wild oatsmixed in with the grain, and this I accomplish by making the screens ofsheet steel of sufiicient' thickness to stand the necessary wear. Thesheets are provided with countersunk perforations of any suitable sizeaccording to the grain to be cleaned, and which form cutting edges,which cooperate with the edge of the screw conveyer, to cut up wild oatsand force them through the perforations with the other screenings.

The concave screens 2 and 4t extend up to about the center line of theconveyors and are provided at their upper edges 10 with lugs 11 to whichthe sheet metal plates 12, constituting the sides or covers of theconveyer boxes are secured by bolts or other fastening means. In theupper conveyer, one edge of the screen is attached to the lower edge ofshoe 3 and its other edge to a. plate 12, whereas in the lower ordischarging conveyer, one edge of the screen is connected to a plate 12,and the other to plate 12 which is made fast at its upper end to theframe of the machine. The two plates 12 connected to the adjacent edgesof the two screens, are connected at their upper ends, by any suitablemeans, to the crank 13 mounted at its ends in bearings 14 and providedwith the handle 15 by which it may be turned. Ordinarily the crank restsin a horizontal position thus maintaining the screens at a distanceremoved from the edge of the screw conveyers as shown in full lines inFig. 2; but when turned up as shown in dotted lines in the same figure,it elevates the screens into contact with the edges of their respectivescrew conveyers.

The screens are detaehably connected to their supports so as to permitthem to be readily detached and others having different sizeperforations, substituted therefor.

The two screw conveyors have sprocket and chain mechanism l617 soconstructed as to drive the lower conveyer at least one third fasterthan the upper conveyer, and one screw conveyer has right hand flightand the other left hand flight, so that as the grain is fed to the upperbox it is moved therein by its conveyer toward the spent (3 anddischarges through the latter into the lower box, and is moved thereinby its conveyer toward the open end 7 from which it is discharged intothe measuring apparatus or to the wagon leader.

In the operation of the machine the rain drops through the separatorsonto the shoe 3 while the tailings are deposited into the conveyer l8and are discharged by the screw therein. The grain passing from theseparators falls onto the shoe 3, and gravitates from the latter intothe upper conveyer, and from the latter into the lower conveyer and outthrough the open end of the latter to the measuring machine or wagonloader. hen the grain has wild oats mixed therewith, the latter, owingto their size and shape, will enter the perforations and in someinstances fall through but when too large will clog the openings andretard the passage of the grain over the screens. Then this happens, orat regular or irregular intervals, the operator elevates lever 15 thusraising plates 12 and screens 2 and 4:, until the latter are close up tothe screw conveyers. The flights of the screw conveyers acting with ashearing and pressing action against the clogged grain, cut off theprojecting portions thus permitting the remaining parts to fall throughthe perforations. The screens are then lowered to their normal positionsand continue their work until it is again necessary to repeat theoperation.

The advantages of this method of clearing the screens of wild oats, willbe evident at once to threshing machine operators. Heretofore it hasbeen impossible with the machines devised for that purpose, to rid thescreens of wild oats with sufficient speed to run grain through properlycleaned to the rated capacity of the machine. In fact no threshingmachines as at present made, so far as I am aware, have means forridding themselves of wild oats. Another advantage in the use of thedouble screens is that in a sixty inch machine, all the grain travelsfrom five to ten feet over screening surface, whereas in other forms thescreening surface is less than three feet.

The construction is such that the screens may be attached to anythreshing machine, and by making the screens detachable I am enabled touse screens, the perforations in which are of a proper size for theparticular grain being cleaned.

It is evident that changes in the construction and relative arrangementof the several parts might be made without avoiding my invention andhence I would have it understood thatIdo not restrict myself to theparticular construction and arrangement of parts shown and described,but,

Having fully described my. invention what I claim as new and desire tosecure by Letters Patent, is

1. In combination with a screen and a shearing conveyer, each of rigidmaterial, and means for elevating the screen toward the conveyer tocooperate therewith to shear material projecting through the screen.

' 2. In a grain separator, the combination of two communicating screensof rigid material, and a screw conveyer in each screen, one of saidscreens being located in a lower plane than the other and both screensadapted to cooperate with the screw conveyer therein to shear wild oats.

3. In a grain separator, the combination of two screens of rigidmaterial arranged in different planes, the upper screen being closed atboth ends and the other being open at one end, a spout connecting oneend of the upper screen with one end of the lower screen, and a screwconveyer in each screen adapted to cooperate therewith to feed grainover the screens and shear wild oats.

4. In grain separators, the combination of two communicating screens ofrigid material, one located in a plane above the other and adapted toreceive the grain from the shoe of the separator and discharge it ontothe lower screen, and a screw conveyer of rigid material for each screenand adapted to cooperate therewith, as and for the purpose set forth.

5. The combination with a screw conveyer of rigid material and a screenof rigid material, of means for elevating the screen toward the conveyerto insure the cooperation of the screen and conveyer to shear wild oats,and means for actuating the screw conveyer.

6. The combination with a screen having countersunk perforationstherein, of a conveyer of rigid material for moving the grain along thescreen, means for elevating the screen into contact with the conveyer toinsure the cooperation of the screen and 0011- veyer to shear wild oats,and means for actuating the conveyer.

7. The combination with a screen of rigid material having perforationstherein, and detachably secured in place, of a conveyer of rigidmaterials for moving the rain over the surface of the screen means foractuating the conveyer and means for elevating the screen into contactwith the conveyer to cooperate with the latter to shear wild oats.

8. The combination with two screens located in different horizontalplanes and a spout connecting them, of a conveyer of rigid materials foreach screen and means for elevating the screens into contact with theconveyers to cooperate therewith to shear wild oats.

9. The combination with two screens located in different horizontalplanes and a spout connecting them, of a conveyer of rigid material foreach screen means for actuating the conveyers and means forsimultaneously elevating the screens into contact with their respectiveconveyers to cooperate with the latter to shear wild oats.

10. The combination with two screens, and conveyers of rigid materialtherein, of plates connected thereto, and a crank shaft con nected tothe upper ends of said plates for raising and lowering the screensrelatively to the conveyers of a spout connecting the screens and meansfor actuating the conveyers.

11. The combination of two screens, a conveyer of rigid material in eachscreen, one screen being closed at both ends and the other open at oneend the said screens being in different horizontal planes and atelescopic spout connecting the two screens.

12. The combination with two screens located in different horizontalplanes and a section of a telescopic spout connected to each screen, ofa conveyer for each screen and means for elevating the screens intocontact with their respective conveyers.

13. The combination with two screens 10- NICHOLAS N. NELSON.

\Vitnesses O. B. Bnnrnnss, B. G. SKULASM.

